He "shocked and surprised'' Sharon Osbourne, she admitted after his audition earlier this year.

When he returned for the Las Vegas round of "America's Got Talent'' last month, the woman who has been married to Black Sabbath frontman Ozzy Osbourne for more than two decades said she was "very frightened'' by what Dittelman did.

Tuesday night, the mind reader from Westborough will once again attempt to wow the "AGT'' judges and, more importantly, TV viewers at home in hopes of edging another step closer to the $1 million prize.

"I'm just really excited for this week,'' Dittelman said in a conference call Monday afternoon.

He plans to perform a new routine on tonight's show and "it should be pretty awesome ... if all goes well.''

He'll be competing for viewers' votes against 11 others for four available slots in the semi-finals of the NBC show. Tonight's broadcast begins at 8. Whether he's successful will be revealed on Wednesday night's broadcast.

The 2003 Westborough High grad got his start with magic acts in elementary school. At Ithaca College, he performed with comedy and improv groups and began to get interested in the psychological aspects of show business. He wanted "to figure out what people were thinking,'' he said.

He's had success with that endeavor, receiving the Rising Star Award for Top Mind Reader in 2011 from GigMasters.com. The 26-year-old has been a featured act at colleges and comedy clubs, including a gig with Boston-area legend Dick Doherty at Doherty's Beantown Escape Comedy Club in Metheun.

"It's amazing experiencing all these acts,'' said Dittelman. "It's an honor to share the stage with them.''

He's grateful for the support back in Westborough, the area that's "always been my hometown,'' and should he be the one to come away with the $1 million deal, he said he'd "want to give back to and support my family, who have always been so supportive of me.''

As for judges Osbourne, Howard Stern and Howie Mandel, "they've been really supportive so far.''

In his first appearance on the show, he wrapped electrical tape around his head to secure his blindfold, then successfully guessed what each judge had drawn on a piece of paper. For the second go-round, he guessed the name Osbourne had written when asked for the moniker of her first crush. After Dittelman correctly identified "Robin,'' Osbourne said she had had just made up the identity on the spot.

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"I think they've really tried to test me,'' Dittelman said of the judges, but so far, he's had the upper hand.

"I've enjoyed messing with their minds a little bit,'' he said.

Messing with the minds of Stern and Mandel as well as Osbourne's. That's quite a trick indeed.

(Julia Spitz can be reached at 508-626-3968 or jspitz@wickedlocal.com. You can also read the Spitz Bits blog at www.metrowestdailynews.com/blogs/spitzbits and follow tweets at twitter.com/SpitzJ.)